Sharpshooter PCB: Video not in color

yaggy

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Got in a SHARPSHOOTER PCB (P&P Marketing, follow up to Police Trainer).

Works for the most part, but seems all RGB video is mixed together somehow resulting in greyscale / mostly white video output. Game can be played, to a degree, but this is clearly not acceptable and on stages where you must shoot a certain color target, it becomes impossible to play. There is nothing wrong with the JAMMA harness or monitor, as I have several other gun game boards that I swap out for variety. Could this be some sort of output transistor problem? Anyone familiar with typical video circuits and seen this type of problem before? I'd hate to trash an otherwise working board for what I think is a pretty cool game. I have a dead Police Trainer board I can pull parts from, but it's noticeable different in quite a few ways, yet similar in others.

Thanks.
 
Have you tried excluded one of the RGB wires to see if some of the colors are working and one of them is messing it all up?
 
Have you tried excluded one of the RGB wires to see if some of the colors are working and one of them is messing it all up?

Thanks, good idea - I once saw a Commando that mostly orange/brown except the tree tops were still pure green. Turned out the RED & BLUE got shorted together.

The harness and connector are fine, as I plug a variety of gun game boards into this salvaged cabinet (zero point, lethal enforcers, etc) and they all come up great. But I see the merit in your idea and it might be a valuable troubleshooting step. Thanks again.
 
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